多个独立波段雷达信号合成技术研究
关键词： 线性调频， 脉冲压缩， 频率步进， 多波段融合， 相干合成， 高距
离分辨率， 雷达成像 Title Synthetic Technique of Multiple Independent Band Radar Signals
Abstract
In order to achieve a high-resolution target imaging and recognition, a
high resolution radar is needed. However, a high resolution radar requires
a ultra-wide bandwidth, it is very difficult to design a radar hardware
with a very high bandwidth. The method of synthesizing multiple independent
band echo signals to obtain high resolution has low hardware requirements
and can achieve a ultra-wide bandwidth，thus it promises a broad developing
future for high resolution radars in the future, here stepped frequency
radar is a typical example. This paper focuses on the study of the synthetic
technology for multiple-band radar signals, the main work is as follow:
1) imaging principles of linear frequency modulation(LFM) signal, pulse
compression and stepped frequency waveform(SFW) are studied, and
simulation results verify these imaging principles.2) A time-domain
synthetic bandwidth algorithm is given. This synthetic algorithm includes
five steps of up-sampling、frequency shifting、phase compensation、time
shifting and signal superimposing to achieve a ultra-wide bandwidth LFM
signal. Simulations show: two sub-band LFM signals can be coherently
synthesized as a wide-bandwidth signal and the range resolution of this
synthesized signal is high-resolution.
Keywords: LFM， pulse compression， SF， multi-band fusion， coherent
synthesis, high range resolution， radar imaging 目 次
1 绪论 1
1.1 课题研究背景及概述 1
1.2 文章主要内容和结构 3
2 线性调频信号、脉冲压缩和频率步进技术 4
2.1 线性调频信号 4
2.2 脉冲压缩 9
2.3 频率步进信号 . 17
2.4 调频步进信号 . 20
2.5 本章小结 . 22
3 时域带宽合成 . 23
3.1 带宽合成概述 . 23
3.2 时域带宽合成原理介绍 . 23
3.3 时域带宽合成仿真 . 32
3.4 本章小结 . 34
4. 合成宽带信号距离成像 35
4.1 合成宽带信号距离成像概述 . 35
4.2 合成宽带信号距离成像仿真 . 36
4.3 本章小结 . 39
结论 40
致谢 41
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